[DevTools] Introduce ServiceWorkerVersion.ScriptLastModified/ScriptResponseTime

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 4057 matching lines @@
             {
                 "id": "ServiceWorkerVersion",
                 "type": "object",
                 "description": "ServiceWorker version.",
                 "properties": [
                     { "name": "versionId", "type": "string" },
                     { "name": "registrationId", "type": "string" },
                     { "name": "scriptURL", "type": "string" },
                     { "name": "runningStatus", "$ref": "ServiceWorkerVersionRunningStatus" },
                     { "name": "status", "$ref": "ServiceWorkerVersionStatus" },
-                    { "name": "updateTime", "type": "number", "optional": true}
+                    { "name": "scriptLastModified", "type": "number", "optional": true, "description": "The Last-Modified header value of the main script." },
+                    { "name": "scriptResponseTime", "type": "number", "optional": true, "description": "The time at which the response headers of the main script were received from the server.  For cached script it is the last time the cache entry was validated." }
                 ]
             },
             {
                 "id": "ServiceWorkerErrorMessage",
                 "type": "object",
                 "description": "ServiceWorker error message.",
                 "properties": [
                     { "name": "errorMessage", "type": "string" },
                     { "name": "registrationId", "type": "string" },
                     { "name": "versionId", "type": "string" },
@@ skipping 965 matching lines @@
                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$ref": "AXNode", "description": "The <code>Accessibility.AXNode</code> for this DOM node, if it exists.", "optional": true }
                 ],
                 "description": "Fetches the accessibility node for this DOM node, if it exists.",
                 "hidden": true
             }
         ]
     }]
 }